Mantle Oceanic crust Continental crust Core Lowest content 3. List the discoveri

Question

Mantle Oceanic crust Continental crust Core Lowest content 3. List the discoveries which led to the theory of plate tectonics in chronological order (1 credit)? First discovery Select an answer... Apparent polar wander Continental drift Magnetic reversals V Seafloor spread Last discovery 4. In terms of absolute* plate motion, why is the Pacific plate subducting beneath the Philippine pla * with respect to a fixed point in the mantle Select an answer 5. Which mineral in your Tellus I mineral and rock box has three well-defined cleavage directions (1 Select an answer making chrismtas

Explanation / Answer

Theory of plate tectonics in chronological order

Continental drift  theory proposed by Alfred Wegner in 1915. Continents were once joined together forming a supercontinent named Pangae meaning 'all land'. After drifting it divided into two parts Gondwana land and laurasia land.

Apparant Polar wandering discovered in 1954. It is the perceived movement of the Earth's paleo-magnetic poles relative to a continent while regarding the continent being studied as fixed in position.

Sea floor spreading proposed by Harry Hess in 1963. Proposed that molten material comes through the crack in mid ocean ridges which causes the seafloor to spread until some of it sinks into the mantle of the Earth at trenches.

Magnetic reversal discovered by two British geologists, Fred Vine and Drummond Mathews. Linked together the Navy's discovery of different strengths of magnetism in ocean rocks. Stronger magnetism showed normal polarity while weaker magnetism showed reverse polarity. Proved Hess's theory right by showing new crust was continuously being produced at mid-ocean ridges.

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